Cleanup in downloads.xml and add ignore properties for newly generated files.
Cleanup in downloads.xml and add ignore properties for newly generated files.

git-svn-id: 7146a936b37d36e51ea0d66f8acbe0b8281bc7b7@1350827 13f79535-47bb-0310-9956-ffa450edef68

apache/flex-sdk,adufilie/flex-sdk,shyamalschandra/flex-sdk,SlavaRa/flex-sdk,danteinforno/flex-sdk,apache/flex-sdk,shyamalschandra/flex-sdk,adufilie/flex-sdk,apache/flex-sdk,shyamalschandra/flex-sdk,apache/flex-sdk,apache/flex-sdk,SlavaRa/flex-sdk,adufilie/flex-sdk,shyamalschandra/flex-sdk,danteinforno/flex-sdk,SlavaRa/flex-sdk,danteinforno/flex-sdk,SlavaRa/flex-sdk,shyamalschandra/flex-sdk,danteinforno/flex-sdk,danteinforno/flex-sdk,adufilie/flex-sdk,danteinforno/flex-sdk,shyamalschandra/flex-sdk,SlavaRa/flex-sdk,adufilie/flex-sdk,adufilie/flex-sdk,SlavaRa/flex-sdk,apache/flex-sdk